Question

How to check if a sequence of numbers is an Arithmetic progression (consecutive differences are the same) in JavaScript

Answer 1

function isArithmeticProgression(arr) {
    const size = arr.length;
    if (size === 1) {
        return true;
    }

    arr.sort((a, b) => a - b);

    const difference = arr[1] - arr[0];
    for (let i = 2; i < size; i++) {
        if (arr[i] - arr[i - 1] !== difference) {
            return false;
        }
    }

    return true;
}

const arr = [10, 20, 15, 5, 25, 35, 30];

console.log(isArithmeticProgression(arr) ? "Yes" : "No");



/*
run:

Yes

*/

 

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